Arrived by train from England. Reliable train service, but a long ride! The train station is well-located in the city. To get around the Loch to different attractions, it is best to take the bus and then hike the area of interest unless you're looking for an extremely long hike!
I can't recommend the Inverness Tourist Hostel highly enough. We cooked a communal dinner and then spent the evening watching TV in the common area and there is even a piano that some folks were playing and singing along to. A great atmostphere, great place to meet people from around the world. Clean and well-maintained, the hostel caretakers were fantastic!
As I arrived in the evening, I only had one full day to explore the Loch. I took the bus to Drumnadrochit, where there is an easy hiking path to get down to the shore of the Loch (https://www.walkhighlands.co.uk/lochness/Urquhartwoods.shtml). Beautiful views of Urquhart Bay at the end of the walk.
After the hike, I continued by bus to Urquhart Castle. It's very old, and you can walk around the ruins of the castle with beautiful views of the Loch. It also overlooks the deepest point in the Loch, so keep an eye out for the monster. At one point, it was raining just over the Loch creating a magnificent rainbow over the castle.